Formula broken when dragged

When I drag down from D14 the multiplier also moves down a box which breaks the formula.

How do I drag down but keep the multiplier as J09?

Thanks.

Title edited (was “helpmeplease” and question retagged).

=SUM(D15+D15*J$09)

You should have a look at the difference between relative and absolute references: Addresses and References, Absolute and Relative.

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Hello,

use absolute addressing for row 9 using $ prefix (=D15*(1+J$9), using function SUM() in this case is superfluous) and read

Ref.: LibreOffice Help - Addresses and References, Absolute and Relative

Hope that helps.